body{
      background-color: #ebebeb;
      font-family: -apple-system;
      font-family: "-apple-system", "Helvetica Neue", "Roboto", "Segoe UI", sans-serif;
    }
    /*如果全是英文或数字强制换行*/
    .content{
      width:100%;
      word-wrap:break-word;
      white-space:normal;
    }
    .chat-receiver{
      clear:both;
      font-size: 100%;
    }
    /*头像*/
    .chat-receiver div:nth-of-type(1){
      float: left;
    }
    /*title*/
    .chat-receiver div:nth-of-type(2){
      margin: 0 50px 2px 50px;
      padding: 0px;
      color: #848484;
      font-size: 16px;
      font-family: '黑体';
      text-align: left;
    }
    /*正文*/
    .chat-receiver div:nth-of-type(3){
      background-color: #B8B8B8;
      /*float: left;*/
      margin: 0px 50px 10px 50px;
      padding: 10px 10px 10px 10px;
      text-indent: -10px;
      border-radius:7px;
    }

    .chat-sender{
      clear:both;
      font-size: 100%;
    }
    .chat-sender div:nth-of-type(1){
      float: right;
    }
    .chat-sender div:nth-of-type(2){
      margin: 0px 50px 2px 50px;
      padding: 0px;
      color: #848484;
      font-size: 16px;
      font-family: '黑体';
      text-align: right;
    }
    .chat-sender div:nth-of-type(3){
      /*float:right;*/
      background-color: #b2e281;
      margin: 0px 50px 10px 50px;
      padding: 10px 10px 10px 10px;
      border-radius:7px;
      text-align: left;
    }

    .chat-sender div:first-child img,
    .chat-receiver div:first-child img{
      width: 40px;
      height: 40px;
      border-radius: 100%;
    }

    .chat-left_triangle{
      height: 0px;
      width: 0px;
      border-width: 6px;
      border-style: solid;
      border-color: transparent #B8B8B8 transparent transparent;
      position: relative;
      left: -22px;
      top: 3px;
    }
    .chat-right_triangle{
      height: 0px;
      width: 0px;
      border-width: 6px;
      border-style: solid;
      border-color: transparent transparent transparent #b2e281;
      position: relative;
      right:-22px;
      top:3px;
    }

    .chat-notice{
      clear: both;
      font-size: 100%;
      color: white;
      text-align: center;
      margin-top: 15px;
      margin-bottom: 15px;
    }
    .chat-notice span{
      background-color: #cecece;
      line-height: 25px;
      border-radius: 5px;
      padding: 5px 10px;
    }
